> ## Documentation Index
> Fetch the complete documentation index at: https://docs.researchanddesire.com/llms.txt
> Use this file to discover all available pages before exploring further.

# What Open Source Means

> Learn about RADR's open source licensing under CERN OHL-S v2, and what this means for contributors.

## Open Source Hardware

RADR is genuinely open source hardware. The project is licensed under the **CERN Open Hardware Licence Version 2 - Strongly Reciprocal (CERN-OHL-S v2)**, the same license used by the [OSSM](/ossm/guides/housekeeping/open-source/introduction).

<Info>
  The strongly reciprocal nature of CERN-OHL-S v2 ensures that derivative works remain open source, protecting the community's collective efforts.
</Info>

## What This Means for You

When you contribute to the RADR GitHub repository, your contributions fall under the same CERN-OHL-S v2 license. You can find the complete license text in the [licence documentation](/radr/guides/housekeeping/open-source/licence).

### You Can

* **Use** RADR designs and software freely
* **Study** how RADR works and learn from its design
* **Modify** the hardware and software to suit your needs
* **Share** your modified versions with others
* **Build and sell** RADR units (with attribution and source sharing)

### You Must

* **Share alike** — If you distribute modifications, they must be under the same license
* **Provide source** — Make your modified designs available when distributing products
* **Retain notices** — Keep copyright and license notices in place

## Source Files

All RADR source files are available on GitHub:

<CardGroup cols={2}>
  <Card title="Hardware Files" icon="microchip" href="https://github.com/researchanddesire/radr-wireless-remote/tree/main/Hardware">
    PCB designs, schematics, and 3D print files.
  </Card>

  <Card title="Firmware Source" icon="code" href="https://github.com/researchanddesire/radr-wireless-remote/tree/main/Software">
    Complete ESP32 firmware source code.
  </Card>
</CardGroup>

### Hardware

* **PCB Design Files** — Altium Designer project files for the main board
* **Schematics** — Full circuit schematics in PDF and native formats
* **Bill of Materials** — Complete parts list with manufacturer part numbers
* **3D Print Files** — STEP and STL files for the enclosure

### Software

* **Firmware** — ESP32-S3 firmware written in C++ using PlatformIO
* **Libraries** — Custom libraries for display, Bluetooth, and device control
* **Device Registry** — JSON configuration for supported Buttplug.io devices

## Community Contributions

Open source means contributions can come from anyone, anywhere. Before using or contributing to RADR:

* Review the [safety guidelines](/ossm/guides/housekeeping/safety) thoroughly
* Understand your personal risks and boundaries
* Familiarize yourself with the contribution process

<DiscordInvite community="kinky-makers" />

## Why Open Source?

We believe in:

1. **Transparency** — You can verify exactly what your device does
2. **Repairability** — Full documentation means you can fix and maintain your device
3. **Customization** — Modify the design to suit your specific needs
4. **Community** — Build on the work of others and contribute back
5. **Longevity** — Open designs outlive any single company

## Related Projects

RADR is part of the Research And Desire ecosystem, alongside other open source projects:

* [OSSM (Open Source Sex Machine)](/ossm/guides/getting-started/introduction)
* [Lockbox](/lkbx/quick-start)
* [Deepthroat Trainer](/dtt/quick-start)

All share the same commitment to open source hardware and community-driven development.